1 | 易学教程

创建一个 Pure Python 3.5,2
New directory 目录
创建一个程序声明一个解释器
Vietw File and Code Templates
写程序
运行print("hello world ")右击
变量
什么是变量？变量是用来干嘛的？
变量是用来存东西的，存东西是为了以后来调用的。
不存就被内存释放了。存在内存里。
怎么定义一个变量name ="Alex Li"
c++string name ="Alex Li"
#调用
print（“My name is”,name）??My name is Alex Li

name = "Alex Li"
name2 = name
print("My name is ",name ,name2)
name="PaoChe Ge"
print(name,name2) ?? Alex Li PaoChe Ge

name 本来指向的是“Alex Li”
name2指向的是name指向的（name只是向name2指一条路，name2并不会随着name的改变而改变。）

标识符
数字、字母、下划线
首字符不能是数字
约定俗成变量名一定要能看懂（虽然Python能是中文执行但是千万不要去用）
gf_of_oldboy="chen rong hua"

变量
常量在Python里是没有这个概念的
若想要定义一个常量变量名要大写

字符编码
计算机
底层储存
两种状态通电和不通电
计算机只能表示01要想表示2怎么办？

古代烽火
弊端：传递的信息量很少
1-100
101-1000
1001-5000
古时候的人们就这样想的
23004
准确的怎么办？
0    0          0    1        1    1         2    1
0    0          0    1        1    0         1    1
   64      32      16     5     4     2     1
    1       0          0     1     0     0     1
153

ASCII    255              1bytes
1980    GB2312        7xxx
1995    GBK1.0         2W+
2000    GB18030     27XXX
            unicode      2bytes
            utf-8 en:1   zh:3
密文的设置
passwd
import getpass
username =input("usename")
password=getpass.getpass("password")
print(username,password)

import getpass
_username = 'alex'
_password = 'abc123'
username =input("usename:")
password=getpass.getpass("password:")
if _username == username and _password=password:
print("Welcome user {name} login...".format(name=username))
else:
print("Invalid username or password!")

#input默认读的结果是字符串
age_of_oldboy=56
guess_age = input("guess age:")
if guess_age == age_of_oldboy:
print("yes, you got it. ")
elif guess_age > age_of_oldboy:
print("think smaller...")
else :
print("think bigger！")

循环
count = 0
while True:
print("count:",count)
count = count + 1

guess

age_of_oldboy =56
count=0
while True:
if count == 3
break
guess_age = int(input("guess age:"))

if guess_age == age_of_oldboy:

print("yes,you got it.")
break

elif guess_age > age_of_oldoy:

print("think smaller...")
else:
print("think bigger!")
count+=1

count = 0
while True:
print("count:",count)
count+=1
if count == 1000:
break

age-of-oldboy =56
count=0
while count<3:
guess-age =int(input("guess age:"))

if guess-age=age-of-oldboy:

print("yes,you got it.")
break

elif guess-age == age-of-oldoy:

print("think smaller...")
else:
print("think bigger!")
count+=1
else:
print("you have tried too many times..fuck off")

for i in range(10):
print("loop",i)
0123456789

age-of-oldboy =56
for i in range(3):
guess-age =int(input("guess age:"))

if guess-age=age-of-oldboy:

print("yes,you got it.")
break

elif guess-age == age-of-oldoy:

print("think smaller...")
else:
print("think bigger!")
else:
print("you have tried too many times..fuck off")

for i in range(0,10,2):
print("loop",i)
02468

for i in range(0,10,3):
print("loop",i)
0319

age-of-oldboy =56
while count< 3:
guess-age =int(input("guess age:"))

if guess-age=age-of-oldboy:
print("yes,you got it.")
break

elif guess-age > age-of-oldoy:

print("think smaller...")
   else:
print("think bigger!")
   count+=1
   if count == 3:
   countine_confirm = input("do you to keep guessing..?L")
   if countine_confirm !='n':
   count = 0

for i in range(0,10):
if i<3:
  print("loop",i)
else:
  continue
  print(hehe...)

break

for i in range(10):
print('-------',i)
for j in range(10):
  print(j)
  if j<5:
   break

博客员

编写登录接口
—输入用户用户密码
—认证成功显示欢迎信息
—输入三次后锁定

import getpass
username
password
getpass.getpass

判断
存用户密码
_username='alex'
_password='abc123'
if_username ==username and _password ==password:
print( )

小的一个登陆程序
超过三次还是这个登陆名去锁定
Python自带的文件处理
用户名对应的密码

来源：https://www.cnblogs.com/qxiaohong/p/12219412.html

标签

alex

guess